IGCSE Chemistry Paper-1: Specimen Questions with Answers 51 - 53 of 99

Question number: 51

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MCQ▾

Question

Which of the following bond is more easier to form?

Choices

Choice (4) Response

a.

Ionic

b.

Covalent

c.

Question does not provide sufficient data or is vague

d.

None of the above

Answer

b.

Explanation

Formation of covalent bond is more easier than that of ionic bond because of energy is always involved when atoms are to either lose or gain electrons. In covalent compounds there is a little requirement of energy.

Question number: 52

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Question

A substance X when kept in a china dish and exposed to sunlight for sometime, changes its colour. What is the substance X?

Finding Substance X in the Dish

Finding Substance X in the Dish

What will be the substance X in the dish after reaction.

Choices

Choice (4) Response

a.

Zinc Carbonate

b.

Silver sulphate

c.

Silver chloride

d.

Hydrogen Iodide

Answer

c.

Explanation

Substance X is Silver Chloride. Silver chloride turns grey in sunlight. This is due to the decomposition of silver chloride into silver and chlorine by light.

Silver chloride decomposes into silver and chlorine.

Question number: 53

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Question

Which of the following bond is present in ethyne?

Choices

Choice (4) Response

a.

C –C

b.

C = H

c.

C ≡ C

d.

C = C

Answer

c.

Explanation

The molecular formula for ethyne is C2H2. The simplest alkyne, a colorless gaseous (at room temperature and pressure) hydrocarbon

 Structure of ethyne

Structure of Ethyne

Diagrammatic representation of Structure of ethyne